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(No Model.) H. E. WAITE.

' MAGNET() TELEPHONE. No. 316,206. Patented Apr.' 21, 188.5.

e llNrrEE STATE-s PATENT OrrriCE. A 'r HENRY E. WARE, E NEW YoruQNj Y.

IVIAGNETO-TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 316,206, dated April 21, 1885.

Application filed September 20, 1884. (No model.)

vented certain new anduseful Improvements in Magneto-Telephones, of which the following is a specication.

My invention relates to magneto-telephones, and has for its object to improve the construction and arrangement of such instruments to render them simple and effective and not liable to get out of order; and to these ends my invention consists in a telephone constructed and arranged as hereinafter more particularly described.

In the accompanying drawings, Figure 1 is a perspective view of the working parts of a telephone embodying myimprovements. Fig. 2 is a sectional view showing the same as applied to one form of a telephone-case.

The case A may be of any suitable construction and material, that illustrated being simple, cheap, and compact, and consists of a body, B, having a detachable mouthpiece,

C, upon one side, and a detachable handle or knob, D, on the other. The diaphragm E, of some magnetic material, is supported upon a ledge or rib in the body of the case, and may be held in position by means of cushions or otherwise.

Secured in the bottom of the recessed or hollow body of the case is a permanent magnet, F, substantially of the form shown-that is t`o say, in the form 0f a ring having one of its ends or poles bent to the center of the ring.

Through the central end or pole of the magnet passes a core, G, of soft iron, and this is adjustably tted in its socket, being screwthreaded at one end. I have found in practice that the core which is thus made adjustable is liable to turn or move, so as to destroy the fine adjustment, and to prevent such accidents I form the screw end of the core with one or more slots, g, extending some distance up the core. By this construction there are formed several branches of the core, which can be sprung or bent outwardly, so as to bear or press against the screw-threads in the magnet-pole and form a sort of lock to prevent the core from moving, at the same time allowing it to be adjusted when neces` sary.

Upon the core is placed the coil H, connected with the line-circuit.

Upon the face of the magnet-pole, and between that and the coil, is placed a magnetic metal strip or plate, I, which embraces the core, and may be secured to the magnet by a pin, p, or other convenient means. One end, t', of this strip I is bent upward and brought into contact with the edge of the magnetic diaphragm E, to which it may be secured by any suitable means, or upon which it may simply bear in magnetic contact. It will thus be seen that the diaphragm is permanently polarized from the inner pole of the permanent magnetand that the soft-iron core is also polarized from the same end.

In order to securely hold the coil in position upon the core, small tongues or spurs s s are formed in the edges or end of the strip I,

which are turned up and forced into the edge of the bobbin upon which the coil is wound, and thereby secure it in position, so that it is not liable to get out of place accidentally or when the core passing through it is adj usted.

Such being the construction of the telephone, its operation is apparent to those skilled in the art, and need not be specifically set forth.

What I claim is- 1. In a magneto-telephone, the combination, with a diaphragm, of a permanent magnet, a `coil or bobbin, and a split core adjustably secured to the magnet and supporting the coil, substantially as set forth.

2. The combination, in a magneto telephone, of a diaphragm, a iiat permanent magnet, a core and coil secured to one end of the magnet, and a metallic strip connecting the pole of the magnet and the diaphragm, substantially as described.

3. The combination, with the magnet and core and bobbin thereon, of a strip secured to the magnet provided with tongues or spurs adapted to secure the bobbin and hold itin place, substantially as described.

4. The combination, with the hollow case,

of a at permanent magnet secured thereon, In testimony whereof I have signed my an adjustable split core passing through one name to this specification in the presence of end of the magnet, a bobbin Aembracing the two subscribing Witnesses.

core, a magnetic diaphragm, and a strip of HENRY E. WAITE. 5 magnetic material secured to the end of the Witnesses:

magnet and bearing upon the diaphragm, sub- A. E. T. HANSMANN,

stantially as described. v i WM. S. SAYERs. 

